:root {
  --paper: #f6f2e9;
  --paper-deep: #efe9db;
  --ink: #1f2421;
  --ink-soft: #4a4f4a;
  --ink-mute: #6b6659;
  --accent: #8c2f1f;
  --teal: #4a6b6a;
  --ochre: #a8875b;
  --rule: #d8d2c2;
  --rule-soft: rgba(216, 210, 194, 0.55);
  --serif: "Noto Serif SC", "Songti SC", "Source Han Serif SC", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --wrap: 1120px;
  --col-main: 720px;
  --col-side: 300px;
  --gap: 40px;
  --radius: 2px;
}

/* ========== base ========== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body.site-body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}

body.site-body a {
  color: var(--ink);
  text-decoration: none;
}

body.site-body a:hover {
  color: var(--accent);
}

body.site-body p {
  margin: 0 0 1em;
}

body.site-body ul,
body.site-body ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

body.site-body h1,
body.site-body h2,
body.site-body h3,
body.site-body h4 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

body.site-body img {
  display: block;
  max-width: 100%;
  height: auto;
}

body.site-body table {
  border-collapse: collapse;
  width: 100%;
}

body.site-body strong {
  font-weight: 700;
}

body.site-body :focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 60;
  padding: 10px 16px;
  background-color: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  font-size: 14px;
  border-radius: var(--radius);
  transition: top 160ms ease;
}

.skip-link:focus {
  top: 12px;
  color: var(--paper);
}

/* ========== layout ========== */

.site-header {
  border-bottom: 1px solid var(--rule);
  background-color: var(--paper);
}

.header-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 18px 24px 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "masthead update"
    "nav nav";
  align-items: center;
  column-gap: 24px;
  row-gap: 12px;
}

.masthead {
  grid-area: masthead;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  min-width: 0;
}

.masthead-brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
}

.masthead-name {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}

.masthead-issue {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 1px 6px;
  white-space: nowrap;
}

.masthead-update {
  grid-area: update;
  margin: 0;
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-mute);
  text-align: right;
  white-space: nowrap;
}

.site-nav {
  grid-area: nav;
  position: relative;
  min-width: 0;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 0 26px;
  border-top: 1px solid var(--rule);
  padding-top: 2px;
}

.nav-list > li {
  display: flex;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.nav-link.is-current {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  position: absolute;
  right: 0;
  top: -46px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background-color: var(--paper);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--ink);
}

.site-main {
  display: block;
}

.home-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 40px 24px 64px;
}

.inner-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 24px 24px 64px;
}

.breadcrumb {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-mute);
  margin-bottom: 18px;
}

.breadcrumb a {
  color: var(--ink-mute);
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.breadcrumb-sep {
  margin: 0 8px;
  color: var(--rule);
}

.breadcrumb-current {
  color: var(--ink-soft);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin: 0 8px;
  color: var(--rule);
}

.page-header {
  margin-bottom: 20px;
}

.page-title {
  font-size: 32px;
  line-height: 1.35;
  letter-spacing: 0;
}

.page-title-block {
  margin-bottom: 32px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--rule);
}

.page-summary {
  font-size: 18px;
  line-height: 1.8;
  color: var(--ink);
  padding-left: 16px;
  border-left: 2px solid var(--accent);
  margin: 0 0 14px;
}

.page-meta {
  margin: 0;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-mute);
}

.page-kicker {
  margin: 0 0 10px;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.page-lead {
  font-size: 18px;
  line-height: 1.8;
  padding-left: 16px;
  border-left: 2px solid var(--accent);
  margin: 0 0 14px;
}

.page-intro {
  margin-bottom: 28px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--rule);
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--col-main)) var(--col-side);
  gap: var(--gap);
  align-items: start;
}

.layout-shell {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 24px 24px 64px;
}

.layout-shell .inner-main {
  padding: 0;
  margin: 0;
  max-width: none;
}

.page-content,
.content-column,
.content-main,
.article-body {
  min-width: 0;
}

.page-aside {
  min-width: 0;
  position: sticky;
  top: 20px;
  font-family: var(--sans);
  font-size: 14px;
}

.site-footer {
  border-top: 1px solid var(--rule);
  background-color: var(--paper-deep);
  color: var(--ink-soft);
}

.footer-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 40px 24px 24px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
}

.footer-title {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink);
  margin: 0 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.footer-note {
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-mute);
  margin: 0 0 10px;
}

.footer-bottom {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 16px 24px 32px;
  border-top: 1px solid var(--rule);
}

.footer-copy {
  margin: 0;
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-mute);
}

/* ========== components ========== */

.section-title {
  font-size: 24px;
  line-height: 1.4;
  margin: 0 0 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}

.section-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 24px;
}

.section-intro {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 22px;
}

.section-note {
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-mute);
  margin: 16px 0 0;
}

.content-section {
  margin-bottom: 44px;
}

.content-section h2 {
  font-size: 24px;
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}

.content-section h3 {
  font-size: 19px;
  margin: 22px 0 8px;
}

.content-section p {
  font-size: 17px;
  line-height: 1.85;
}

.footnote,
.footnote-line,
.section-footnote,
.footnote-note {
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-mute);
  margin: 18px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--rule-soft);
}

.footnote a,
.footnote-line a,
.section-footnote a,
.footnote-note a {
  color: var(--accent);
  border-bottom: 1px solid rgba(140, 47, 31, 0.4);
}

.footnote-mark {
  display: inline-block;
  margin-right: 6px;
  font-size: 11px;
  vertical-align: super;
  color: var(--accent);
}

.figure-caption {
  margin: 10px 0 0;
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mute);
  padding-left: 12px;
  border-left: 2px solid var(--rule);
}

.content-figure,
.media-figure,
.figure-block,
.faq-figure,
.cover-figure,
.boundary-figure {
  margin: 0 0 24px;
}

.content-figure img,
.media-figure img,
.figure-block img,
.faq-figure img,
.cover-figure img,
.boundary-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background-color: var(--paper-deep);
}

.table-wrap {
  overflow-x: auto;
  margin: 0 0 8px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.data-table {
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.7;
  min-width: 100%;
}

.data-table caption,
.table-caption {
  caption-side: top;
  text-align: left;
  padding: 12px 14px;
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-mute);
  border-bottom: 1px solid var(--rule);
  background-color: var(--paper-deep);
}

.data-table thead th {
  text-align: left;
  font-weight: 600;
  font-size: 13px;
  color: var(--ink);
  background-color: var(--paper-deep);
  padding: 10px 14px;
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}

.data-table tbody th {
  text-align: left;
  font-weight: 600;
  color: var(--ink);
  padding: 12px 14px;
  border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
}

.data-table tbody td {
  padding: 12px 14px;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
}

.data-table tbody tr:last-child th,
.data-table tbody tr:last-child td {
  border-bottom: 0;
}

.data-table tbody tr:hover {
  background-color: rgba(216, 210, 194, 0.4);
}

.term-list {
  margin: 18px 0 22px;
  border-top: 1px solid var(--rule);
}

.term-item {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--rule-soft);
}

.term-item dt {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

.term-item dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.anchor-bar {
  margin: 0 0 32px;
  padding: 8px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.anchor-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 8px;
}

.anchor-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink-soft);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background-color: var(--paper);
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.anchor-link:hover,
.anchor-link:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
  background-color: var(--paper-deep);
}

.aside-title {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink);
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
}

.aside-nav,
.aside-toc,
.toc-nav {
  margin-bottom: 24px;
}

.aside-nav ul,
.aside-toc,
.toc-list,
.aside-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.aside-nav a,
.aside-toc a,
.toc-link,
.aside-link {
  display: block;
  padding: 7px 0 7px 12px;
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-soft);
  border-left: 2px solid var(--rule);
  transition: color 160ms ease, border-color 160ms ease;
}

.aside-nav a:hover,
.aside-toc a:hover,
.toc-link:hover,
.aside-link:hover,
.aside-nav a:focus-visible,
.aside-toc a:focus-visible,
.toc-link:focus-visible,
.aside-link:focus-visible {
  color: var(--accent);
  border-left-color: var(--accent);
}

.aside-note,
.aside-block,
.aside-related {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
}

.aside-note-title,
.aside-subtitle {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 10px;
}

.aside-note p {
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-mute);
  margin: 0;
}

.aside-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.aside-links a {
  display: block;
  padding: 6px 0;
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.aside-links a:hover,
.aside-links a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.aside-list--secondary {
  margin-top: 2px;
}

/* ========== pages: index ========== */

.cover-section {
  display: grid;
  grid-template-columns: minmax(0, 1.38fr) minmax(0, 1fr);
  gap: var(--gap);
  padding-bottom: 36px;
  margin-bottom: 40px;
  border-bottom: 2px solid var(--ink);
}

.cover-primary {
  min-width: 0;
}

.cover-kicker {
  margin: 0 0 10px;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.cover-primary h1 {
  font-size: 38px;
  line-height: 1.3;
  margin: 0 0 16px;
}

.cover-summary {
  font-size: 18px;
  line-height: 1.8;
  color: var(--ink-soft);
  padding-left: 16px;
  border-left: 2px solid var(--accent);
  margin: 0 0 24px;
}

.cover-figure {
  margin: 0;
}

.cover-figure img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.cover-contents {
  min-width: 0;
  padding-left: 24px;
  border-left: 1px solid var(--rule);
}

.contents-title {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}

.contents-list {
  counter-reset: contents;
  display: flex;
  flex-direction: column;
}

.contents-item {
  counter-increment: contents;
  border-bottom: 1px dotted var(--rule);
}

.contents-item a {
  display: block;
  padding: 12px 0;
  transition: background-color 160ms ease;
}

.contents-item a:hover,
.contents-item a:focus-visible {
  background-color: rgba(216, 210, 194, 0.4);
}

.contents-label {
  display: block;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
}

.contents-label::before {
  content: counter(contents, decimal-leading-zero);
  margin-right: 8px;
  font-size: 12px;
  color: var(--accent);
}

.contents-note {
  display: block;
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mute);
  margin-top: 2px;
}

.pathways-section,
.structure-section,
.dossier-section,
.steps-section,
.boundary-section {
  margin-bottom: 48px;
}

.pathways-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.pathway-box {
  min-width: 0;
  padding: 22px;
  border: 1px solid var(--rule);
  border-top: 3px solid var(--teal);
  border-radius: var(--radius);
  background-color: #fbf8f1;
}

.pathway-box:last-child {
  border-top-color: var(--ochre);
}

.pathway-title {
  font-size: 19px;
  margin: 0 0 8px;
}

.pathway-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 14px;
}

.pathway-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-top: 1px solid var(--rule-soft);
  padding-top: 10px;
}

.pathway-links a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink);
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.pathway-links a::before {
  content: "§";
  margin-right: 8px;
  color: var(--accent);
  font-size: 12px;
}

.pathway-links a:hover,
.pathway-links a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.structure-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-bottom: 22px;
}

.structure-block {
  min-width: 0;
  padding: 20px 18px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background-color: #fbf8f1;
}

.structure-block--group {
  border-left: 4px solid var(--teal);
}

.structure-block--channel {
  border-left: 4px solid var(--ochre);
}

.structure-block--topic {
  border-left: 4px solid var(--accent);
}

.structure-label {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
  margin: 0 0 6px;
}

.structure-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 12px;
}

.structure-link {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--accent);
  border-bottom: 1px solid rgba(140, 47, 31, 0.4);
  transition: border-color 160ms ease;
}

.structure-link:hover,
.structure-link:focus-visible {
  border-bottom-color: var(--accent);
}

.structure-conclusion {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  padding: 18px 0 0;
  border-top: 1px solid var(--rule);
}

.structure-conclusion p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.dossier-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.dossier-table {
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.7;
  min-width: 640px;
}

.dossier-caption {
  caption-side: top;
  text-align: left;
  padding: 12px 16px;
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-mute);
  border-bottom: 1px solid var(--rule);
  background-color: var(--paper-deep);
}

.dossier-table thead th {
  text-align: left;
  font-weight: 600;
  font-size: 13px;
  padding: 10px 16px;
  color: var(--ink);
  background-color: var(--paper-deep);
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}

.dossier-table tbody th {
  text-align: left;
  font-weight: 600;
  padding: 12px 16px;
  color: var(--accent);
  border-bottom: 1px solid var(--rule-soft);
  white-space: nowrap;
  vertical-align: top;
}

.dossier-table tbody td {
  padding: 12px 16px;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
}

.dossier-table tbody tr:last-child th,
.dossier-table tbody tr:last-child td {
  border-bottom: 0;
}

.dossier-table tbody tr:hover {
  background-color: rgba(216, 210, 194, 0.4);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  counter-reset: none;
}

.steps-section .step-item {
  min-width: 0;
  padding: 18px 16px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background-color: #fbf8f1;
}

.steps-section .step-number {
  display: block;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 6px;
}

.steps-section .step-name {
  font-size: 18px;
  margin: 0 0 8px;
}

.steps-section .step-text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

.steps-section .step-link {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--accent);
  border-bottom: 1px solid rgba(140, 47, 31, 0.4);
}

.steps-section .step-link:hover,
.steps-section .step-link:focus-visible {
  border-bottom-color: var(--accent);
}

.boundary-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.boundary-figure {
  margin: 0;
}

.boundary-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.boundary-content {
  min-width: 0;
}

.boundary-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 16px;
}

.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.boundary-item {
  padding: 12px 14px;
  border-left: 3px solid var(--ochre);
  background-color: #fbf8f1;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.boundary-item strong {
  display: block;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 14px;
  margin-bottom: 2px;
}

.boundary-more {
  margin: 0;
  font-family: var(--sans);
  font-size: 14px;
}

.boundary-more a {
  color: var(--accent);
  border-bottom: 1px solid rgba(140, 47, 31, 0.4);
}

.boundary-more a:hover,
.boundary-more a:focus-visible {
  border-bottom-color: var(--accent);
}

/* ========== pages: channel-guide ========== */

.page-channel-guide .page-title {
  margin-bottom: 0;
}

.page-channel-guide .page-title-block {
  border-bottom: 0;
  padding-bottom: 0;
  margin-bottom: 8px;
}

.channel-group {
  margin: 0 0 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--rule);
}

.channel-group h3 {
  font-size: 20px;
  margin: 0 0 8px;
}

.channel-group > p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 14px;
}

.channel-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--rule);
}

.channel-row {
  display: grid;
  grid-template-columns: 56px minmax(120px, 0.9fr) minmax(0, 2fr) auto;
  gap: 14px;
  align-items: baseline;
  padding: 14px 4px;
  border-bottom: 1px solid var(--rule-soft);
  transition: background-color 160ms ease;
}

.channel-row:hover {
  background-color: rgba(216, 210, 194, 0.4);
}

.channel-code {
  font-family: var(--sans);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.06em;
}

.channel-name {
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.channel-desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.channel-link {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--accent);
  white-space: nowrap;
  border-bottom: 1px solid rgba(140, 47, 31, 0.4);
}

.channel-link:hover,
.channel-link:focus-visible {
  border-bottom-color: var(--accent);
}

.reading-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 18px 0 0;
  counter-reset: reading;
}

.reading-item {
  counter-increment: reading;
  position: relative;
  padding: 10px 0 10px 40px;
  border-bottom: 1px solid var(--rule-soft);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.reading-item::before {
  content: counter(reading, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 10px;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--accent);
}

/* ========== pages: topic-dossier ========== */

.dossier-rules {
  margin-bottom: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--rule);
}

.dossier-rules h2,
.dossier-list h2,
.dossier-figure h2,
.dossier-cross h2,
.dossier-more h2 {
  font-size: 24px;
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}

.dossier-rules p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.rule-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.rule-cell {
  min-width: 0;
  padding: 16px;
  border: 1px solid var(--rule);
  border-top: 3px solid var(--teal);
  border-radius: var(--radius);
  background-color: #fbf8f1;
}

.rule-cell:nth-child(2) {
  border-top-color: var(--ochre);
}

.rule-cell:nth-child(3) {
  border-top-color: var(--accent);
}

.rule-cell-title {
  font-size: 17px;
  margin: 0 0 6px;
}

.rule-cell-text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 0;
}

.dossier-list {
  margin-bottom: 40px;
}

.dossier-entry {
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
}

.dossier-entry:first-of-type {
  border-top: 1px solid var(--rule);
}

.entry-issue {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin: 0 0 4px;
}

.entry-title {
  font-size: 21px;
  margin: 0 0 10px;
}

.entry-scope,
.entry-compose,
.entry-order {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 6px;
}

.entry-scope strong,
.entry-compose strong,
.entry-order strong {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink);
  margin-right: 6px;
}

.entry-link {
  margin: 10px 0 0;
  font-family: var(--sans);
  font-size: 14px;
}

.entry-link a {
  color: var(--accent);
  border-bottom: 1px solid rgba(140, 47, 31, 0.4);
}

.entry-link a:hover,
.entry-link a:focus-visible {
  border-bottom-color: var(--accent);
}

.dossier-figure {
  margin-bottom: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--rule);
}

.figure-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  margin-top: 18px;
}

.figure-row .media-figure {
  margin: 0;
}

.figure-row .media-figure img {
  width: 100%;
  aspect-ratio: 16 / 11;
  object-fit: cover;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.figure-text {
  min-width: 0;
}

.figure-text p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 12px;
}

.dossier-cross {
  margin-bottom: 40px;
}

.cross-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 18px;
}

.cross-col {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background-color: #fbf8f1;
}

.cross-col-title {
  font-size: 17px;
  margin: 0 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule-soft);
}

.cross-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.cross-list a {
  display: block;
  padding: 6px 0;
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.cross-list a:hover,
.cross-list a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.dossier-more {
  margin-bottom: 8px;
}

.more-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 24px;
  margin-top: 16px;
}

.more-list a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.more-list a::before {
  content: "→";
  margin-right: 8px;
  color: var(--accent);
  font-size: 12px;
}

.more-list a:hover,
.more-list a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ========== pages: viewing-guide ========== */

.guide-section {
  margin-bottom: 44px;
}

.guide-section .section-title {
  margin-bottom: 10px;
}

.figure-block--wide {
  margin: 0 0 22px;
}

.figure-block--wide img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.check-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 6px;
}

.check-item {
  min-width: 0;
  padding: 16px;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--teal);
  border-radius: var(--radius);
  background-color: #fbf8f1;
}

.check-name {
  font-size: 17px;
  margin: 0 0 6px;
}

.check-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 0;
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 6px;
}

.guide-section .step-item {
  min-width: 0;
  padding: 18px 16px;
  border: 1px solid var(--rule);
  border-top: 3px solid var(--ochre);
  border-radius: var(--radius);
  background-color: #fbf8f1;
}

.guide-section .step-num {
  display: block;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 6px;
}

.guide-section .step-name {
  font-size: 17px;
  margin: 0 0 8px;
}

.guide-section .step-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

.guide-section .step-link {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--accent);
  border-bottom: 1px solid rgba(140, 47, 31, 0.4);
}

.guide-section .step-link:hover,
.guide-section .step-link:focus-visible {
  border-bottom-color: var(--accent);
}

.trouble-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 6px;
  border-top: 1px solid var(--rule);
}

.trouble-item {
  padding: 16px 0 16px 20px;
  border-bottom: 1px solid var(--rule-soft);
  border-left: 2px solid var(--rule);
}

.trouble-name {
  font-size: 17px;
  margin: 0 0 6px;
}

.trouble-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.trouble-link {
  color: var(--accent);
  border-bottom: 1px solid rgba(140, 47, 31, 0.4);
}

.trouble-link:hover,
.trouble-link:focus-visible {
  border-bottom-color: var(--accent);
}

.toc-item + .toc-item {
  margin-top: 0;
}

/* ========== pages: entry-check ========== */

.page-entry-check .page-kicker {
  margin-bottom: 10px;
}

.check-defs {
  margin: 18px 0 0;
  border-top: 1px solid var(--rule);
}

.check-def {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--rule-soft);
}

.check-def dt {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

.check-def dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.check-table tbody td:last-child {
  color: var(--ink);
}

.myth-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 6px;
  border-top: 1px solid var(--rule);
}

.myth-item {
  padding: 14px 0;
  border-bottom: 1px solid var(--rule-soft);
}

.myth-claim {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  margin: 0 0 4px;
  padding-left: 22px;
  position: relative;
}

.myth-claim::before {
  content: "×";
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--sans);
  color: var(--accent);
  font-weight: 700;
}

.myth-fact {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
  padding-left: 22px;
  position: relative;
}

.myth-fact::before {
  content: "√";
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--sans);
  color: var(--teal);
  font-weight: 700;
}

.link-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 14px 0;
  border-top: 1px solid var(--rule-soft);
  padding-top: 10px;
}

.link-list a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--accent);
  border-bottom: 1px solid transparent;
  transition: border-color 160ms ease;
}

.link-list a::before {
  content: "§";
  margin-right: 8px;
  font-size: 12px;
}

.link-list a:hover,
.link-list a:focus-visible {
  border-bottom-color: var(--accent);
}

.aside-block h2 {
  margin-top: 0;
}

/* ========== pages: faq ========== */

.faq-group {
  margin-bottom: 40px;
}

.faq-group .section-title {
  margin-bottom: 8px;
}

.faq-item {
  border-bottom: 1px solid var(--rule);
}

.faq-item:first-of-type {
  border-top: 1px solid var(--rule);
}

.faq-question {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  min-height: 48px;
  padding: 14px 0;
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  transition: color 160ms ease;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--sans);
  font-size: 18px;
  font-weight: 400;
  color: var(--accent);
  transition: transform 160ms ease;
}

.faq-item[open] .faq-question {
  color: var(--accent);
}

.faq-item[open] .faq-question::after {
  transform: rotate(45deg);
}

.faq-question:hover {
  color: var(--accent);
}

.faq-answer {
  padding: 0 0 16px;
}

.faq-answer p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

.faq-more {
  font-family: var(--sans);
  font-size: 13px;
  margin: 0;
}

.faq-more a {
  color: var(--accent);
  border-bottom: 1px solid rgba(140, 47, 31, 0.4);
}

.faq-more a:hover,
.faq-more a:focus-visible {
  border-bottom-color: var(--accent);
}

.faq-checklist {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 8px 0 12px;
  padding-left: 0;
}

.faq-checklist li {
  position: relative;
  padding-left: 20px;
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.faq-checklist li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 6px;
  height: 6px;
  background-color: var(--ochre);
  border-radius: 50%;
}

.faq-figure {
  margin: 32px 0 0;
}

.faq-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

/* ========== pages: about ========== */

.article-body .page-title-block h1 {
  display: none;
}

.article-body .content-section h2 {
  font-size: 24px;
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}

.principle-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 16px 0;
  counter-reset: principle;
  border-top: 1px solid var(--rule);
}

.principle-item {
  counter-increment: principle;
  position: relative;
  padding: 14px 0 14px 44px;
  border-bottom: 1px solid var(--rule-soft);
}

.principle-item::before {
  content: counter(principle, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 16px;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--accent);
}

.principle-name {
  font-size: 17px;
  margin: 0 0 4px;
}

.principle-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.boundary-title {
  font-size: 16px;
  margin: 0 0 4px;
}

.boundary-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.next-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 24px;
  margin: 16px 0 0;
}

.next-links a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.next-links a::before {
  content: "→";
  margin-right: 8px;
  color: var(--accent);
  font-size: 12px;
}

.next-links a:hover,
.next-links a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ========== pages: policies ========== */

.policy-section {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--rule);
}

.policy-section .section-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
}

.section-num {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 400;
  color: var(--accent);
  letter-spacing: 0.08em;
}

.policy-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 16px 0 0;
  border-top: 1px solid var(--rule);
}

.policy-item {
  padding: 14px 0;
  border-bottom: 1px solid var(--rule-soft);
}

.policy-item-title {
  font-size: 16px;
  margin: 0 0 4px;
}

.policy-item p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.policy-figure {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--rule);
}

.policy-figure .figure-block {
  margin: 16px 0 0;
}

.policy-figure .figure-block img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.policy-changelog {
  margin-bottom: 8px;
}

.record-table {
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.7;
  margin-top: 16px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.record-table thead th {
  text-align: left;
  font-weight: 600;
  font-size: 13px;
  padding: 10px 14px;
  color: var(--ink);
  background-color: var(--paper-deep);
  border-bottom: 1px solid var(--rule);
}

.record-table tbody td {
  padding: 12px 14px;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--rule-soft);
}

.record-table tbody tr:last-child td {
  border-bottom: 0;
}

.aside-toc-item a {
  display: block;
}

/* ========== pages: 404 ========== */

.error-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 48px 24px 64px;
}

.error-title {
  padding-bottom: 28px;
  margin-bottom: 36px;
  border-bottom: 2px solid var(--ink);
}

.error-code {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin: 0 0 10px;
}

.error-title h1 {
  font-size: 34px;
  line-height: 1.35;
  margin: 0 0 14px;
}

.error-paths {
  margin-bottom: 40px;
}

.error-paths h2,
.error-tips h2 {
  font-size: 22px;
  margin: 0 0 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}

.error-note {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 18px;
}

.error-link-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.error-link-list a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 10px 16px;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--teal);
  border-radius: var(--radius);
  background-color: #fbf8f1;
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.error-link-list a:hover,
.error-link-list a:focus-visible {
  color: var(--accent);
  border-left-color: var(--accent);
  background-color: var(--paper-deep);
}

.error-tips {
  margin-bottom: 20px;
}

.error-tip-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--rule);
}

.error-tip-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--rule-soft);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.tip-label {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.error-footnote {
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-mute);
  padding-top: 12px;
  border-top: 1px solid var(--rule-soft);
  margin: 0;
}

/* ========== responsive ========== */

@media (max-width: 1024px) {
  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .page-aside {
    position: static;
    padding-top: 24px;
    border-top: 1px solid var(--rule);
  }

  .cover-primary h1 {
    font-size: 32px;
  }

  .structure-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .steps-grid,
  .step-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .rule-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .error-link-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .channel-row {
    grid-template-columns: 48px minmax(110px, 0.9fr) minmax(0, 1.8fr) auto;
    gap: 10px;
  }
}

@media (max-width: 720px) {
  body.site-body {
    font-size: 16px;
    line-height: 1.8;
  }

  .header-inner {
    padding: 14px 16px 0;
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "masthead toggle"
      "nav nav";
    column-gap: 12px;
    row-gap: 10px;
  }

  .masthead {
    gap: 4px 10px;
  }

  .masthead-name {
    font-size: 18px;
  }

  .masthead-issue {
    font-size: 11px;
  }

  .masthead-update {
    display: none;
  }

  .nav-toggle {
    display: flex;
    position: static;
    grid-area: toggle;
    align-self: center;
  }

  .site-nav {
    grid-area: nav;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    gap: 0;
    border-top: 1px solid var(--rule);
    padding: 4px 0 10px;
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-list > li {
    display: block;
  }

  .nav-link {
    display: flex;
    min-height: 48px;
    width: 100%;
    font-size: 15px;
    border-bottom: 1px solid var(--rule-soft);
  }

  .nav-link.is-current {
    border-bottom-color: var(--rule-soft);
    color: var(--accent);
  }

  .home-main,
  .inner-main,
  .layout-shell {
    padding: 20px 16px 48px;
  }

  .layout-shell .inner-main {
    padding: 0;
  }

  .breadcrumb {
    font-size: 12px;
    margin-bottom: 14px;
  }

  .page-title {
    font-size: 24px;
    line-height: 1.4;
  }

  .page-summary,
  .page-lead {
    font-size: 16px;
    padding-left: 12px;
  }

  .section-title,
  .content-section h2,
  .dossier-rules h2,
  .dossier-list h2,
  .dossier-figure h2,
  .dossier-cross h2,
  .dossier-more h2 {
    font-size: 20px;
  }

  .content-section h3,
  .channel-group h3 {
    font-size: 18px;
  }

  .cover-section {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding-bottom: 24px;
    margin-bottom: 28px;
  }

  .cover-primary h1 {
    font-size: 26px;
    line-height: 1.35;
  }

  .cover-summary {
    font-size: 16px;
    padding-left: 12px;
  }

  .cover-contents {
    padding-left: 0;
    border-left: 0;
    padding-top: 20px;
    border-top: 1px solid var(--rule);
  }

  .pathways-grid,
  .structure-grid,
  .structure-conclusion,
  .boundary-grid,
  .figure-row,
  .cross-columns,
  .check-list,
  .steps-grid,
  .step-grid,
  .rule-grid,
  .more-list,
  .next-links,
  .error-link-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .steps-grid,
  .step-grid {
    gap: 12px;
  }

  .structure-block,
  .pathway-box,
  .rule-cell,
  .cross-col,
  .check-item,
  .steps-section .step-item,
  .guide-section .step-item {
    padding: 16px 14px;
  }

  .term-item,
  .check-def {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .channel-row {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "code link"
      "name name"
      "desc desc";
    gap: 4px 12px;
    padding: 14px 2px;
  }

  .channel-code {
    grid-area: code;
  }

  .channel-name {
    grid-area: name;
  }

  .channel-desc {
    grid-area: desc;
  }

  .channel-link {
    grid-area: link;
  }

  .dossier-table {
    min-width: 0;
  }

  .dossier-table thead {
    display: none;
  }

  .dossier-table,
  .dossier-table tbody,
  .dossier-table tr,
  .dossier-table th,
  .dossier-table td {
    display: block;
    width: 100%;
  }

  .dossier-table tbody tr {
    padding: 12px 14px;
    border-bottom: 1px solid var(--rule);
  }

  .dossier-table tbody tr:last-child {
    border-bottom: 0;
  }

  .dossier-table tbody th {
    padding: 0 0 4px;
    border-bottom: 0;
  }

  .dossier-table tbody td {
    padding: 2px 0;
    border-bottom: 0;
    display: flex;
    gap: 8px;
  }

  .dossier-table tbody td::before {
    content: attr(data-label);
    flex: 0 0 68px;
    font-family: var(--sans);
    font-size: 12px;
    color: var(--ink-mute);
  }

  .data-table tbody th,
  .data-table tbody td {
    padding: 10px 12px;
  }

  .data-table {
    font-size: 13px;
  }

  .check-table thead {
    display: none;
  }

  .check-table,
  .check-table tbody,
  .check-table tr,
  .check-table th,
  .check-table td {
    display: block;
    width: 100%;
  }

  .check-table tbody tr {
    padding: 14px;
    border-bottom: 1px solid var(--rule);
  }

  .check-table tbody tr:last-child {
    border-bottom: 0;
  }

  .check-table tbody th {
    padding: 0 0 6px;
    border-bottom: 0;
    font-size: 15px;
  }

  .check-table tbody td {
    padding: 2px 0;
    border-bottom: 0;
  }

  .check-table tbody td::before {
    content: attr(data-label);
    display: block;
    font-family: var(--sans);
    font-size: 12px;
    color: var(--ink-mute);
  }

  .faq-question {
    font-size: 15px;
    padding: 12px 0;
  }

  .faq-answer p {
    font-size: 15px;
  }

  .article-body .content-section h2 {
    font-size: 20px;
  }

  .principle-item {
    padding-left: 36px;
  }

  .reading-item {
    padding-left: 34px;
  }

  .error-main {
    padding: 28px 16px 48px;
  }

  .error-title {
    padding-bottom: 20px;
    margin-bottom: 26px;
  }

  .error-title h1 {
    font-size: 26px;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 28px 16px 16px;
  }

  .footer-bottom {
    padding: 14px 16px 28px;
  }

  .footer-links {
    gap: 0;
  }

  .footer-links a {
    min-height: 40px;
    border-bottom: 1px solid var(--rule-soft);
  }

  .anchor-list {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
  }

  .anchor-link {
    flex: 0 0 auto;
  }

  .aside-nav a,
  .aside-toc a,
  .toc-link,
  .aside-link {
    min-height: 40px;
    display: flex;
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}